Possible addition: add "anti-1/f" transform?

[TomDonoghue]

In their recent paper, Samaha & Cohen introduce an "anti-1/f" transform. Maybe we could add an implementation of this?

It's actually pretty simple - and something we have most of the tooling for - what they do is fit a 1/f line, then spectrally rotate the signal, reverting back to a timeseries. To add this, all we'd really need to do is add a helper function to combine spectral rotation with an estimate of the slope.

They have a code available: https://osf.io/f8jqd/
Reference: https://www.sciencedirect.com/science/article/pii/S1053811922000581